Trace element determinations in Fe-Mn oxides by high resolution ICP-MS after Tm addition

Area of Science:

• Geochemistry
• Analytical Chemistry
• Marine Science

Background:

• Ferromanganese (Fe-Mn) oxides are crucial marine geological materials.
• Accurate trace element and Rare Earth Element (REE) analysis is vital for understanding their formation and history.
• Existing analytical procedures may lack optimization for Fe-Mn oxide matrices.

Purpose of the Study:

• To propose an optimal analytical procedure for ferromanganese (Fe-Mn) oxides using ICP-MS.
• To evaluate different data acquisition modes for trace element and REE determination.
• To provide accurate and precise analytical data for certified reference materials.

Main Methods:

• Inductively coupled plasma mass spectrometry (ICP-MS) was employed.
• Chemical dissolution of eight Fe-Mn nodules and crusts.
• Investigation of isobaric interference correction using mono-elemental solutions and high-resolution mode.
• Addition of a thulium (Tm) spike for internal standardization.

Main Results:

• High-resolution ICP-MS acquisition mode was found to be unnecessary for high-quality REE data in Fe-Mn oxides.
• A revised analytical method was developed and validated.
• Consistent, precise, and accurate values were obtained for eight reference materials.

Conclusions:

• The developed analytical procedure offers an efficient and reliable method for REE determination in Fe-Mn oxides.
• The study provides validated data for important geological reference materials.
• Simplified ICP-MS data acquisition strategies are sufficient for accurate analysis of REE in complex matrices like Fe-Mn oxides.